The American Society of Engineers states that Slabjacking is
"A method of injecting a grout by pressure to raise and restore
settled concrete. It has been in use since 1934 and has proven
to be an acceptable alternative to concrete replacement. It has
also been proven to be EFFECTIVE ON ALL CONCRETE
SURFACES."

A recent trade publication states "Slabjacking offers not only
large MONETARY SAVINGS, but offers MANY ADDITIONAL
BENEFITS that should be considered before replacing
concrete. One of which is the SAVING OF OUR NATURAL
RESOURCES AND ENVIROMENT from this:

Holes are cored through the concrete slab. A cement grout
is pumped under pressure to compress the sub-soil. Upon
the compaction of this material (and voids being filled), the
pressure of the grout then raises the sunken slab. Thus
restoring the concrete slab to its proper pitch and grade!
This process also STRENGTHENS and STABILIZES the
concrete slab.